I used to use without any problems the R-1.8.1 package in a SUN Solaris machine. Specifically, I used to call the libraries "affy", "nlme", "cluster" with no problem. However, today I could not call the library "cluster". Why is that? Did we have any major changes on the R program that I am not aware? Below I indicate the error messages that I got. > library(affy) ##loads okay > library(nlme) ##loads okay > library(Biobase) ##loads okay > library(cluster) ##these 3 library below do not load! Why? Error in testRversion(descfields) : This package has not been installed properly See the Note in ?library > library(XML) Error in testRversion(descfields) : This package has not been installed properly See the Note in ?library > library(AnnBuilder) Error in testRversion(descfields) : This package has not been installed properly See the Note in ?library Thanks in advance for the help. Roger Roger L. Vallejo, Ph.D. Assist. Professor of Genomics & Bioinformatics The Pennsylvania State University Department of Dairy & Animal Science 305 Henning Building University Park, PA 16802 Phone: (814) 865-1846 Fax: (814) 863-6042 Email: rvallejo@psu.edu <mailto:rvallejo@psu.edu> [[alternative HTML version deleted]]